Pump, compressor, and motor



Fully l?, 1923- BALQQS v J. BAUDOT PUMP, COMPRESSOR, AND MOTOR July 17,w23 f www@ J. EAUIDDT PUMP, COMPRESSOR, AND MOTOR Filed Dec. 28, 19214-SheetsSheet 2 J. BAUDQT PUMP, COMPRESSOR, AND MOTOR Filed Dec. 28.1921 4 Sheets-Sheet 5 Fig. X

.Fuy 17, 1923- J. BAUDOT PUMP, COMPRESSOR, AND MOTOR Filed Dc.

28. 1921 I 4 Sheets-Sheet 4 lit BED

To all 'whom fm de tio/neem:

Be it known that l, Josnrr-r BAUno'r a French citizen, and resident of lCite rlil'rlauteville, Paris, France, have invented certain new anduseful lm'provements in Pumps, Compressors, and Motors, of which thefollowing is a specification.

rllhe present invention relates to a rotary apparatus with controlledpiston blades which is capable of serving either as a compressor andvacuum pump, or as a rotary motor for all fluids.

'llhis apparatus is characterized by a particular arrangement of itsmembers permitting of almost completely avoiding the frictional eorts ofthe piston blades Whilst ensuring a regular delivery and, by reason ofthe arrangement of the Whole apparatus, producing a progressivevariation of the gaseous volume generated either by compression beforeits discharge, or by expansion or development according as to Whetherthe apparatus is employed as a vacuum pump or compressor, or Whether itis einployed as a motor.

ln the accompanying drawings.

Fig. 1 is a cross section of the rotary apu paratus with controlledpistonv blades.

Fig. 2 is a longitudinal section along the :motor shaft.

Figs. 3 and 4. show respectively an end view and a side vievv of adouble blade.

Figs. 5 and 6 show respectively a iront view and a cross section of thecontro-lling member for the blades.

Figs? and 8 shovv modified forms oi' the rotary apparatus.

The apparatus shown in Figs. l and 2 consists preferably ot a pumpcasing l closed at the front and baclr by plates 2 and 3 and in. whichis mounted in such a manner as to be tangential to one ont itsgenetrices, a cy lindrical motor drinn 7lhis drum rotates with slightfriction i its bearings provided for this purpose on the inner surfaceor' the closing plates 2 and 8. lt rotates on bosses 5 and provided onthe said plates and with respect to which they are arrangedeccentrically.

A motor shaft 6 passes through the cen-- tre oi the plate 2 andterminates in the pl 3 through which it may also in the c' or theoperation o" a series i' similar to that described.. Tn the plate 3 isprrr dicated connect ber 7 in the form or a star Wi es (Figs. 5 and 6)and sleeve by means of which it is secured upon the motor shaft. Each ofthe tour branches of this star-member 7 has a smh shaft 8 passingthrough its end, which on either side of the branch is provided with aroller or ball bearing device 9.

rlhese rollers7 in the assembled apparatus bear against roller guides11, l1 (Fig. 1) provided on double blades l0, l0.

At theirI central portions the double blades are provided with anelongated aperture (Figs. 3 and 4) in order to permit of the passage ofthe motor shaft 6 and of the sleeve of the star member 7, and the rollerguides are formed on this central portion. rlhe double blades are atright angles one to the other and their actual blades engage with andcan slide in openings or guides formed in the motor drum e.' lt may bementioned that the blade members are reduced at their central portion (Fig. 4:) se as to permit of them being arranged at right angles ashereinbeiiere described.

A. port l2 (Fig. l) terminates in the inn terior of the pump body l alittle point of a tangent to the drum. This port serves for the suctionwhen the apparatus operates as a pump or compressor and the outlet port"when the apparatus operates es a motor.

A.. port i3 placed above the point ci tangent above referred to, servesas the outlet port in the case of a pump or con or even as the inletport :tor the {dui-d in the case of a motor.

The port 12 entends suciently tar into the interior o' the body i whilstthe port i3, on the contrary, is off small dimensions that each end otthe hiades ter this latter port as near as poss te the tangential point.This arrange ent oi the its ports has for its object a progre sive in'the volume et the j termed hetrveen the body i, are. l and cessiveblades, in such gaseous fluid drawn in at .lf/J is compressed before itsdischwge The apparatus constructed as hereinbefore described operates inthe following manner.

If the motor 6 is rotated in the direction of the arrow m it moves withit the star member 7. The rollers 9, 9 bear against the roller guides10, 10 of the blades thus turning these, and these latter in turn rotatethe drum in consequence of their engagement with the guides formedtherein.

As the centre of the motor shaft 6 is disposed eccentrically, relativelyto the centre of the drum 4, the blades 10, 10 are caused to slide inthe said guides not by the friction of their ends against the inner wallof the pump body 1, but by reason of the combined movements of themember 7 and the motor drum 4 turning around different axes. The drum 4serves as the point of support for the blades and only allows them to bemoved along a line passing through the centre ofthe drum 4, whilst theiralternate longitudinal movement in the guides of the drum is producedand limited by the rollers 9, 9 which drive them and which serve astheir point of support.

From the foregoing it will be seen that no friction is produced betweenthe ends 0f the blades and the inner wall of the pump body. It will alsobe seen that the volume enclosed between two blades reaches its maximumat Y and that this volume will be reduced in Z. This phenomenon will beproduced four times at each revolution and the gases drawn in at 12 willbe discharged in a reduced volume at 18.

If, however, the apparatus rotates in the opposite direction to thearrow m the fluid entering at 13 is expanded during its passage throughthe apparatus and will leave at 12 with a larger volume.

The fluid-tightness of the apparatus may be obtained either by means ofoil serving for the lubrication thereof or by a liquid added for thispurpose. In certain cases the liquid maybe mercury.

In the case of a vacuum pump and a compressor the liquid expelled at thesame time as the gases returns into the port 13 and ensures thefluid-tightness between the body of the pump and the motor drum.

In the case of operation as a motor, the ports may be so disposed as toobtain a better use of the liquid as a hydraulic seal.

The cooling of the apparatus is effected by the circulation of waterthrough chambers provided for this purpose in the body ofthe pump andthe closing plates.

It will be understood that by such an arrangement of the apparatus theeffect of centrifugal force tending to drive the blades against the bodyof the pum i is avoided by the point of support forme by the rollers 9,9 which are directly connected to the mos tor shaft 6.

When the apparatus is adapted to operate simply a's a vacuum pum orcompressor at low pressure only a sing e double blade need be provided.This is the case in thev modified form of construction illustrated inFigures 7 and 8.

The modification illustrated in these ligures is provided with a drivingmechanism consisting of two blade driving devices 15, 15 placed one oneach side of the pump in the interior of the drum and keyed to the motorshaft 16.

These blade driving devices are provided at their Aends with trunnionson which are mounted rollers or ball bearings 17, 17 en-' gaging withroller guides 18, 18 formed on the double blade and arranged at rightangles to the blades.

This modification ensures the same guiding movement for the blades andalso frictionless operation as is obtained by the device illustrated inFigure 1.

It will also be seen that the ports are arranged at the top and thatwhen the apparatus is to operate as a pump of low vacuum'the inlet portis provided with a light valve which will be raised by a slight pressureof the gas in the interior.

In this case the port is placed as near as possible to the tangentialpoint of the drum in the body of the pump in such a manner with thevolume enclosed between one 0f the ends of the blade, the body of thepump and the drum will be reduced as much as possible so as to reducethe action of the at* mospheric pressure on the surface of the blade onthe charging side. Whenthe apparatus operates with suiiiciently lowvacuums the valve will only be raised when the pressure of the gasesenclosed between the blade, the body of the pump and the cylinderslightly exceeds the external pressure.

'When the blade has uncovered the inlet port, the small quantity of gasremaining in the space formed between the blade, the body of the pumpand the drum, near to the tangential point, expands into the largerspace limited by the other blade. The internal pressure will then beconsiderably reduced on the surface of the blade on the charging side sothat a considerable saving effected in the power necessary foroperation.

`When the vacuum reaches the maximum the pump will only be raised veryrarely, the difference in pressures existing on the two faces of theends of the blades will decrease with the increase of depressionobtained.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is '1. A rotary fiuid pump, compressor, ormotor comprising a. acketed casing with inlet and outlet ports, a shaftcentrally mounted in said casing, a drum eccentrically Manege mounted inthe casing, and rotatable therein, said drum being provided withperipheral guide slots, a bearing member having an opening forengagement over the shaft, oppositely disposed blades mounted on saidearing member, said blades being arranged radially in the drum, saidbearing member having guide surfaces thereon, and a driving member keyedto the shaft for producing Ia radial movement of the blades and forturning the drum through the medium of the blades.

2. A rotary pump, compressor, or motor comprising a jacketed casinghaving inlet and outlet ports, jacketed end plates mounted at the endsof the casing, a driving shaft mounted centrally in said end plates,inwardly turned eccentric bosses on said end plates, ball bearings onsaid bosses, a drum with guide slots in its periphery eccentricallymounted in said casing and revoluble on said ball bearings, a pluralityof double blades radially mounted in said drum and guided by said slots,a central connecting portion between each pair of oppositely disposedblades, said connecting portion having an o ening therein to permit ofthe passage of t e driving shaft and to permit of movement of theblades, a sleeve keyed to the driving shaft and passing through the slotin the connecting portion, radial arms secured to the sleeve, rollersmounted on said arms and engaging with said connecting portion, saidrollers being adapted to movel the blades radially outwards and also toturn them around the shaft.

3. A rotary pump, compressor, or motor comprising a jacketed casinghaving inlet and outlet ports, jacketed end plates mounted at the endsof the casing, a driving shaft mounted centrally in said end plates,inwardly turned eccentric bosses on said end plates, ball bearings onsaid bosses, a drum with guide slots in its periphery eccentricallymounted in said casing and revoluble on said ball bearings, a pluralityof double blades radially mounted in said drum and guidedV by saidslots, a central connecting portion between each pair of oppositelydisposed blades, said connecting portion having an opening therein topermit of the assage of the driving shaft and to permit o movement ofthe blades, the blades being reduced in width at the middle portionthereof so that two pairs of blades may be arranged at right angles toone another, a sleeve keyed to the driving shaft and passing through theslot in the connecting portion, radial arms secured to the sleeve,rollers mounted on said arms and engaging with said connecting portion,said rollers being adapted to move the blades radially outwards and alsoto turn them around the shaft.

4. A rotary pump comprising, a casing having an in et and an outletport, a drive shaft centrally mounted therein, a bearing memberpositioned on said shaft and having oppositely disposed blades, a drummounted eccentrically inthe casing and having peripheral slots slidablyreceiving said blades, and an intermediate member keyed to the shaftandr cooperating with said bearing member, whereby the intermediatememberv is driven by the shaft, and drives the drum, by means of thebearing member and blades.

JOSEPH BAUDOT. Witness:

LEON FUANELDENT.

